Tenualosa ilisha, commonly known as the Hilsa shad, is a species of fish found primarily in the rivers and coastal waters of South Asia, particularly in the Bengal River Delta. It is highly valued for its taste and is a staple in the diets of many people in countries like Bangladesh and India. This fish can grow up to 60 centimeters in length and is known for its silver body and distinctive flavor. Tenualosa ilisha migrates between freshwater and saltwater, making it anadromous. Its spawning season typically occurs during the monsoon, when it moves upstream to breed in rivers.